I am using Unity version 2022.3.7f1 which seems to be the correct version of Unity for this course. I have already scrapped my game project and restarted once to try and fix this problem, but I am getting the same result.
I have the male dummy characters, with the transform position and rotation set to all zero. The scene is set to Pivot, not Center. The plain is set to position and rotation all zero as well.
In the game window the character is shown floating in the air above the plain, and when I run the game, the character starts by falling down to the ground. Once it has fallen, and I press T the character moves to the target (4, 0, 4) position as expected.
I assume I have done something obviously wrong here, but really cannot see it.